Screen.



A No; 632,2ol.

Patented Ag. 29, |899. D. E. PHILLIPS. v

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(Appximin med Aug. 1s, 1894.)

(No Mudel.) I

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Nrrnn STATI-3s .DAVID E. PHILLIPS, OF MAHANOY CITY, PENNSYLVANIA, ASSIGNOR TO THE I CLINTON WIRE ACLOTH COMPANY, OF CLINTON, MASSACHUSETTS,

SCREEN.

SPECIFICATION forming part of" nee-.ers Patent No. 632,201, dated August 29, 1899.

Application filed August 13, 1894. Serial No.520,130. (No model.)

To CLZZ wil/0m, it may concern.-

Be it known that I, DAVID E.`PHILLIPs, of Mahanoy City, county of Schuylkill, State of Pennsylvania, have invented an Improvement in Screens, of which the following description, in connection With the accompanying drawings, is aspecification, like letters on the drawings representing like parts.

This invention relates to screens for screening refractory material-such as coal, gravel, tbe-by causing the material to pass over an irregular surface having suitable interstices or perforations therein. Woven wire has been extensively employed for such purposes, the meshes forming the interstices, and such screens are effective in their action, but it is difficult to firmly secure the Wires'together Where they cross, and the hard usage to which such screens are subjected wears them out rapidly. To overcome these objections, screens have been made from heavy punched sheet metal, and while they Wear better and longer than Wire screens they are not so eective, for the material slides over the smooth surface of the sheet-iron instead of being thoroughly broken up and tumbled, which is necessary to properly screen the material.

My invention has for its object the production of a punched sheet-metal screen which has all of the advantages of a Woven-Wire screen without any of its objectionable features; and it consists, essentially, in a metal screen having an integral web provided with substantially quadrilateral interstices, each interstice having twov substantially straight and parallel sides and the other two sides bent or curved in opposite directions with relation to the working face, substantially as will be described.

Other features of my invention will be hereinafter described, and particularly pointed out in the claims.

Figure l is a perspective view of one of the sections or segments of a screen embodying my invention. Fig. 2 is a section thereof, taken on the line fr or. Fig. 3 is a similar view on the line y y, Fig. l; and Fig. 4 is a perspective detail view of a modification to be described.

IVhile I have herein shown the section or segment as curved to be used in a cylindrical screen, it is to be understood that the degree of curvature may be varied and, if desired, the sections may be flat for use in chutes and the like.

The sections or segments are preferably made from stout sheet-metal webs c of any desired thickness, according to the nature of the material to be screened, and openings or interstices ZJ are formed therein by punching. 6o

As shown in Fig. l, the openings or interstces c are quadrilateral in form, preferably substantially rectangular. Two of the sides of each interstice, as b and b2, are substantially straight and parallel and, as'shown in 65 Figs. 1 to 3, in the plane of the web d of the section or segment. These sides, however, may be slightly convex and concave alternately, as shown at c and c', Fig. 4, the highest and lowest points in the sides being oppo- 7o site the portions of the web separating two interstices in the next adjacent row.

The other two sides a2 and a3 of each interstice are bent or turned in opposite directions, the side a2 being bent or curved upwardly or 75 convexed relative to the Working face of the web, and the side d3 is bent in the opposite direction or concaved relative to the working face, and preferably the edges of the said sides are in parallel planes at right angles to 8o the web.

In punching the openings or interstices they are arranged, preferably, in parallel rows and staggered or alternated, so that the interstices of one row are opposite the portions of the web separating and forming the bent or curved sides of the interstices of the adjacent rows, such arrangement increasing the effective operation of the screen in tumbling and separating the material. 9o

From the foregoing description it will be obvious that the sections are integral, or made of a single piece of metal, resulting in great strength and endurance and performing the operation of screening most effectively.

The segments may be cast, if desired, and will give good results; but I prefer to punch l them from sheet metal.

I claim- 1. A metal screen having an integral web Ico provided with substantially quadrilateral interstices, each interstice having two substan- 3. A metal screen having an integral web I5 portion with rectangular interstices, two, opposite, sides of any one interstiee being the one concave, and the other convex with relation to the working face, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

DAVID E. PHILLIPS.

Vitnesses:

PHAON HERMANY, FRANK H. SNYDER. 

